You should know that means nothing.
FACT: according to the order book, someone willing to cash out just 18 Million USD takes us to a BTC valuation in the low single digits. Not a lot of money in the whole scheme of things.
Imagine satoshi decides to cash out the 1MBTC he has, because is time for him to retire. Yes, you know what would happen: BTC would suddenly go to 0. And that will happen, sooner or later, because nobody can wait to be rich forever. Just pray that the market depth will be 10,000 times bigger than now, so we just go to low double digits when he decides to sell, and not straight to 0.